J2534 Sniffer added
New MITM logger mode: ECUBridge sits between the flash tool and the ECU, logging all CAN traffic with session markup — ideal for reversing Security Access and flashing algorithms.
Diagnose any ECU.
All protocols. One tool.
Advanced ECU diagnostics, chip tuning, CAN sniffer and remote access for automotive professionals.
No sign-up needed — the demo opens instantly with sample data.
Capabilities
Everything you need
Everything you need
in one platform
From live OBD data to ECU firmware — DiagExt covers the full diagnostic workflow.
J2534 Multi-Adapter
Universal J2534 PassThru support — connect any compatible adapter from any vendor.
OBD / UDS / KWP2000
Full multi-protocol coverage: read and clear DTCs, live data, freeze frames, adaptations.
ECU Programming
Read, analyse and patch ECU firmware with built-in checksum and integrity tools.
Session Scheduling
Plan diagnostic sessions, assign technicians, track job status in real time.
Vehicle Database
Extensive database of makes, models and ECU types — always up to date.
Team Access
Multi-technician workspace with roles, permissions and full audit trail.
Try it now
See DiagExt in action — no sign-up
Open the app and you are instantly in demo mode with sample data. Nothing to install, nothing to fill in.
- Full application interface
- CRM: clients & calendar with sample data
- Vehicle & ECU database
- No installation, no registration
Adapter connection and saving changes unlock after sign-up — free for 1 month on Start plan features.
Workflow
Simple from day one
Connect, diagnose, report — in minutes, not hours.
Connect your adapter
Plug in any J2534-compatible adapter. DiagExt detects it automatically via the included Windows client.
Select vehicle & protocol
Choose the vehicle from the database or configure manually. Select OBD, UDS, KWP2000 or raw CAN.
Diagnose & act
Read live data, clear faults, read/write firmware, generate reports — all from a clean browser interface.
Pricing
Simple, honest plans
Every new account starts with a 1-month free trial on Start plan features.
Start
$3/mo
- 1 user
- Up to 100 clients
- Calendar & CRM
- OBD / UDS / KWP diagnostics
- 500 MB file storage
MOST POPULAR
Pro
$9/mo
- Everything in Start
- Up to 500 clients
- J2534 sniffer (MITM logger)
- 1 GB file storage
Ext
$17/mo
- Everything in Pro
- 2 users
- Unlimited clients
- P2P remote access
- Firmware read / write
- 2 GB file storage
Operator
Custom
- Unlimited team
- Unlimited clients
- Roles & shared client base
- All platform features
1 month free after sign-up (Start plan features), no card required. Then pick a plan that fits.
Updates
NEW
NEW
NEW
NEW
NEW
NEW
SOON
SOON
SOON
What's new
The platform keeps evolving — here's the latest.
P2P remote access is live
Connect directly to a client's adapter over the internet: remote diagnostics and a raw CAN bridge (Tunnel mode) without TeamViewer or port forwarding. Direct P2P with automatic NAT traversal, relay fallback when needed.
Instant demo mode
Open the app without an account and explore the full interface with sample data — clients, calendar, diagnostics. Sign up when you are ready for a 1-month free trial on Start plan features.
VIN decoding
Instant offline VIN decode — country, manufacturer, model year and check-digit validation, right in the diagnostic toolbar and on every vehicle card.
4 color themes
Dark, light, midnight indigo and a high-contrast AMOLED black theme — pick what's easiest on your eyes in the shop or on the road.
Repeat visits made faster
One click on a client's vehicle history rebooks it — client, phone, VIN and past work carried over into a new appointment automatically.
Checksum recalculation & correction — in development
Automatic checksum recalculation when firmware is edited: patch a map, and the file gets valid checksums for supported ECUs — no third-party tools.
Full USB device passthrough
Forward an entire USB device to a remote workstation — not just J2534. Even adapters that only talk to their own vendor software will work remotely.
Also on the roadmap
ECU connection & pinout diagrams, brand-specific diagnostic protocols, a fully mobile-friendly interface and complete English translation.
FAQ
Frequently asked questions
Short answers to what we get asked most often.
Do I need to install anything?
The application runs in your browser. To talk to a diagnostic adapter you install one lightweight Windows client (ECUBridge) — it links your J2534 adapter to the web app. The demo needs nothing at all.
Which adapters are supported?
Any J2534 PassThru compatible adapter from any vendor — Scanmatik, Openport, MongoosePro, PCMflash-compatible interfaces and others. If it ships with a J2534 driver, it works.
Is there a free version?
Yes, twice over: an instant demo with sample data (no account needed) and a 1-month free trial with Start plan features after sign-up. No card required.
Which protocols does DiagExt speak?
OBD-II, UDS (ISO 14229), KWP2000, raw CAN and K-Line. Read and clear DTCs, live data, freeze frames, adaptations, plus firmware-level operations on supported ECUs.
Can I diagnose a car remotely?
Yes. With P2P remote access the adapter is plugged in at the client's side while you work from your browser — direct encrypted connection, no TeamViewer, no port forwarding, relay fallback if the network is restrictive.
Is it suitable for a workshop with several technicians?
Yes — DiagExt includes a built-in CRM: client base, vehicle history, session calendar and team roles with permissions on the Ext and Operator plans.
Ready to get started?
Open the web app directly — no installation required on the server side.
Launch DiagExt →